Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f488abada24ca55…

MALICIOUS

PDF

83.9 KB Created: 2021-08-19 19:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b02c03c90a475620c9d99562b1a8b21 SHA-1: c1ac89fdf79f05356f43c0902348a8b3be28d5c0 SHA-256: 2f488abada24ca55a2f9933fbb66c60f6c09b8681f70f6656ead19f31bf9b9ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm that directs users to multiple distinct hosts, many of which are compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to these external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/57a505415b68ea133f761767009a3852/kuwilupevitaju.pdf
    • http://xboxheerlen.nl/userfiles/file/98689654422.pdf
    • http://simonide.org/userfiles/file/19043215354.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b990fb94c93---nigugewixulekebova.pdf
    • https://horizontire.com/userfiles/file/47794102888.pdf
    • http://meteosputnik.ru/userfiles/file/rerox.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cg93lkpqogsqm857g59gtoerbv/dajoso.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a6b88cf1c---36929320720.pdf
    • https://hirurgija.me//files/85238271748.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a37e593611b---zawevemidedakorono.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c9f4bb74b41f9847b3339d4b75473d26/dutobevuzivotajuxumozeki.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/26468175168.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd6f744d2969ee51595ce96031849954/wimalofibunopusaxamuvow.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7475cc20667ac8e7a2807c6e35dda5ed/21704455396.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a1a26c7896---25992067758.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eff31437dc---rewijejizofuleditas.pdf
    • https://gregoryshow.ru/files/file/3578468989.pdf
    • https://bursac.net/userfiles/file/683964609.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086790bbf340---74300012885.pdf
    • http://locthanhwindow.com/img_duhoc/files/44934129930.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3613d1c1c3e54d1eaa7ed78f1b4aab73/60166964764.pdf
    • https://bruceautoservice.com/files/file/ditipamawixigonafal.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe1e0d240---xepamejotilerigisemujur.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/091ce19cd1dd9b820f3db69af6211520/jokepofetupe.pdf
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/7726076330.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ejercicios+resueltos+de+la+ley+de+los+gases+ideales+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd93.bin
8b83c43a95549d81c0ef3367c2105d2e9d578af779e98a863f669976d48f8b4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 11016 bytes
font_01_sfnt_off0000f71b.bin
ceb373267a91d1c0973623d56edb6c25cdac008b0ae4c7f3a7adfbea8d7fa39c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 18712 bytes
font_02_sfnt_off000126d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126D9 16792 bytes